Daily News Staff and News Services Thanks, but no thanks. That's essentially what state Rep. Jack Patrick Lewis, D-Framingham, told supporters who apparently urged him to run for mayor this fall. Instead, Lewis is throwing his support behind former Selectman and City Councilor Charlie Sisitsky, who is officially launching his campaign for mayor with a formal announcement at 5 p.m. today at Framingham's Historic Village Hall, 2 Oak St. "Thank you to everyone who urged me to run to be the next mayor of Framingham," Lewis said in a statement to supporters. "I love representing you and advo...